int Database :: Put(const WriteOptions & oWriteOptions, const uint64_t llInstanceID, const std::string & sValue)
{
if (!m_bHasInit)
{
PLG1Err("no init yet");
return -1;
}
std::string sFileID;
int ret = ValueToFileID(oWriteOptions, llInstanceID, sValue, sFileID);
if (ret != 0)
{
return ret;
}
ret = PutToLevelDB(false, llInstanceID, sFileID);
return ret;
}
int Database :: SetMinChosenInstanceID(const WriteOptions & oWriteOptions, const uint64_t llMinInstanceID)
{
if (!m_bHasInit)
{
PLG1Err("no init yet");
return -1;
}
static uint64_t llMinKey = MINCHOSEN_KEY;
char sValue[sizeof(uint64_t)] = {0};
memcpy(sValue, &llMinInstanceID, sizeof(uint64_t));
int ret = PutToLevelDB(true, llMinKey, string(sValue, sizeof(uint64_t)));
if (ret != 0)
{
return ret;
}
PLG1Imp("ok, min chosen instanceid %lu", llMinInstanceID);
return 0;
}
int Database :: Put(const WriteOptions & oWriteOptions, const uint64_t llInstanceID, const std::string & sValue)
{
if (!m_bHasInit)
{
PLG1Err("no init yet");
return -1;
}
std::string sFileID;
// 将值写入到文件之中。
int ret = ValueToFileID(oWriteOptions, llInstanceID, sValue, sFileID);
if (ret != 0)
{
return ret;
}
// 有点迷糊，为啥还要写一遍到 levelDB里呢?
//04-23 : 已经搞清楚，这里的levelDB其实只存索引，充分利用levelDB的写优势。
// 这样写索引会非常快速，读真实的值由于通过索引查找也会非常快速，而且真实
// 的值存储是顺序存储，按照InstanceID的顺序，删除会非常方便。
ret = PutToLevelDB(false, llInstanceID, sFileID);
return ret;
}
int Database :: SetMasterVariables(const WriteOptions & oWriteOptions, const std::string & sBuffer)
{
static uint64_t llMasterVariablesKey = MASTERVARIABLES_KEY;
return PutToLevelDB(true, llMasterVariablesKey, sBuffer);
}
